Meister



(NoModel.)

F. GILDEMEISTER. DRILLING MACHINE.

No. 464,126.. Patented Dec. 1, 1891.

v UNITED STATES PATENT OEE-ICE..

FRIEDRICH GILDEMEISTER, OF BIELEFELD, GERMANY.

DRlLLlNG-MACHINE.

SPECIFICATION forming partof Letters Patent No. 464,126, dated December 1, 1891.

Serial No. 390.863. (No model.)

To all whom t may concern.:

Be it known that I, FRIEDRICH GILDE- MEISTER, a subject of the King of Prussia, and a resident of Bielefeld, Province of Westphalia, German Empire, have invented a new and useful Drilling-Machine, of which the fol-4 lowing is a clear and exact specification.

My invention relates to improvements in drilling-machines; and the object of the same is to enable a quick and precise start, a swifter drilling, and also an exactv guiding of the drill, thereby producing by far cleaner and neater holes than could possibly be arrived at in ma chines hitherto in use. I attain this object by providing the machine with a feeding device which can be actuated by hand-lever or in the usual manner by hand-wheel, pinion, and spur-wheel. In both cases the raising of the spindle is a self-acting one by either counterweight or spring. For guiding thedrill the wall-machine is provided with fastening or locking devices, hereinafter more fully eX- plained.

In order to have my invention well understood, I refer to the accompanying drawings, in which similar letters denote similar parts throughout the dierent views, and in which- Figure 1 is an elevation of the complete drillingmachine. Fig. 2 is a plan. Figs. 3 to 6 are details of the drill-spindle and feeding device, and Figs. 7 and 8 are details for guiding and locking the arms of the frame.

The upper bearing y of the screw n, being in one with the frame fr, has a bracket h cast on, bearing the pivot of a sector-shaped arm t' and a vertical `shaft lo. The sector-shaped arm t' has a half-nut 7l attached to the end thereof which gears into the screw n. The vertical shaft k is on top provided with an eccentric or cam lo and on its lower end with a handle within easy reach of the workman. By left-handed turningof the handle the cam will press against the arm e' and gear the nut c" into the thread of the screw fn, thus forcing the spindle to move down when made to revolve by the wheels p. When turning the handle right-handed, the cam will release the nut, which will be thrown out of gear by the spiral spring m. The screw fn, thus being at liberty to move vertically, may be drawn upward along with the drill-spindle by the counter-weight q or by a spring. (Not illustrated on the drawings.) The sector-shaped armi and spring m may be replaced by the device illustrated in Figs. 5 and 6. Here there is a slide 0^ attached to the nut, operating in combination with an eccentric in similar manner as before- The drill-spindle s is connected to the screw n in the following manner: The pressure-bolt t is let into the upper end of the spindle, and being provided with a boss is coupled thereunto by a screw-plug t. The rear end of tis also let into the screw and attached to the same by a pin. 'A collar fu. sits on an oEset of the bolt t and is also attached to it by a pin. Between the under face of the screw and the collar u there is a loose ring o, which is linked to the hand-lever z by two pivots, the handlever z having the form of a fork, between which the ring u is hinged. The bearingpoints of the spindle s and the boltt being rounded 0E, case-hardened, and always kept ,properly oiled will permit the pressure to be transmitted to the spindle without loss of power by friction.

In wall-drilling machines the frame a, carrying the spindle, may be hinged to a wallbracket and thus able to rotate. The lower bearing e has a disk e cast on concentrical to the axis of rotation. Unto the frame a there is a lug f cast on, holding a stopperscrew g or cam g for the sake of tighteningV the same to the disk e. applied to the frame Having thus fully described the nature of said invention and in what manner the same The same device is is to be performed, I declare that what I claim 1. In a drilling-machine, a half-nut i', gearing into the thread of the spindle-screw and operated by ahand-lever, in combination with a drill-spindle and a counter-weight tending to raise the spindle, as and for the purpose set forth.

2. In a wall-drilling machine, the disk: e', cast onto the hinge, in combination with a stopper-screw carried by the rotating arm and locking the same against the disk, as and for the purpose set forth.

3. In a drilling-machine, the half-nut i',

IOC

gearing into the thread of the spindle-screw specification in the presence of two subscribu and operated by ak handle, in combination ing Witnesses.

' with a hand-lever z the drill-spindle s the 1 spindle-screw fn, the7 loose ring o and xed FRIEDRICH GILDEMEISTER' 5 ring u, the pressure-bolt t, and screw-plug t', Witnesses:

as and for the purpose set forth. HUGO RIEBR,

In testimony whereof I have signed this HERMANN KUHFUS. 

